1591505243 has 2 divisors, whose sum is σ = 1591505244. Its totient is φ = 1591505242.

The previous prime is 1591505233. The next prime is 1591505281. The reversal of 1591505243 is 3425051951.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1591505243 - 2¹⁰ = 1591504219 is a prime.

It is not a weakly prime, because it can be changed into another prime (1591505233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 795752621 + 795752622.

It is an arithmetic number, because the mean of its divisors is an integer number (795752622).

Almost surely, 2^1591505243 is an apocalyptic number.

1591505243 is a deficient number, since it is larger than the sum of its proper divisors (1).

1591505243 is an equidigital number, since it uses as much as digits as its factorization.

1591505243 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27000, while the sum is 35.

The square root of 1591505243 is about 39893.6742228640. The cubic root of 1591505243 is about 1167.5335195728.

The spelling of 1591505243 in words is "one billion, five hundred ninety-one million, five hundred five thousand, two hundred forty-three".